Rail fastener loose detection method

Abstract

The invention discloses a rail fastener loose detection method and relates to the field of track safety. The rail fastener loose detection method comprises the following steps of moving a knocking deice along a rail line, and at the same time, knocking continuously the rail according to the scheduled time interval; moving a signal collecting device which is behind the knocking device and kept in a preset distance with the knocking device, and at the same time, collecting residual knocked vibration signals of the rail; obtaining a three-dimensional spectral plot according to the residual vibration signals, and identifying the loose position and loose degree of the rail according to mutation condition of a second preset spectra amplitude mutation in the three-dimensional spectral plot. The rail fastener loose detection method is nondestructive, the three-dimensional spectral plot of the rail is obtained by the way of knocking and collecting the residual vibration signals and the like to position the loose position of the fastener, and the positioning is rapid and accurate.

Description

technical field [0001] The invention relates to the technical field of rail safety, in particular to a method for detecting loose rail fasteners. Background technique [0002] During the high-speed running of the train, the severe vibration of the rail can easily lead to loose bolts or fatigue fracture of the fasteners, and the loosening of a fastener will often induce the loosening of the surrounding fasteners, which will aggravate the dynamic irregularity of the track. And then cause serious train derailment hidden danger. Until now, whether abroad or at home, relevant preventive measures rely entirely on manual patrols and regular tightening. Among them, regular full tightness is completely a last resort expedient measure, while the safety of the track during normal hours is completely dependent on the manual patrol method that is prone to missed inspections. For this reason, people have been actively looking for a detection method that can automatically, efficiently an...

AI Technical Summary

Problems solved by technology

Among them, the optical image recognition technology simulates the human eye to identify whether the fastener is loose or not. Since this method does not involve the essence of things, that is, the loose fastener corresponds to the change of the dynamic properties or acoustic properties of the rail, so this method is easy to produce Missed detection; As for the natural frequency identification technology, it is based on the fact that the natural frequency of the structure will be changed after the fastener is loose, but the sensitivity of the natural frequency to the loosening of the fastener is very low, making this method difficult to implement

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